US20190301596A1 - Electric oil pump - Google Patents
Electric oil pump Download PDFInfo
- Publication number
- US20190301596A1 US20190301596A1 US16/357,346 US201916357346A US2019301596A1 US 20190301596 A1 US20190301596 A1 US 20190301596A1 US 201916357346 A US201916357346 A US 201916357346A US 2019301596 A1 US2019301596 A1 US 2019301596A1
- Authority
- US
- United States
- Prior art keywords
- substrate
- axial direction
- electric oil
- oil pump
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000758 substrate Substances 0.000 claims abstract description 97
- 230000004323 axial length Effects 0.000 claims abstract description 13
- 230000005855 radiation Effects 0.000 claims description 28
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000036772 blood pressure Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/007—General arrangements of parts; Frames and supporting elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/008—Enclosed motor pump units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
- F04C13/001—Pumps for particular liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/008—Prime movers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/20—Fluid liquid, i.e. incompressible
- F04C2210/206—Oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
- F04C2240/403—Electric motor with inverter for speed control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/803—Electric connectors or cables; Fittings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
Definitions
- the disclosure relates to an electric oil pump.
- An electric oil pump having a structure including a pump part, a motor part for driving the pump part, and a control part for controlling an operation of the motor part is known.
- the pump part is disposed on one side of the motor part in the axial direction, and a shaft extending from the motor part passes through a pump body of the pump part.
- An accommodating portion which is open on one side of the pump body in the axial direction and recessed toward the other side in the axial direction is provided in an end surface of the pump body on one side in the axial direction.
- a pump rotor is accommodated in the accommodating portion.
- the control part has a substrate on which electronic components for driving the motor part are mounted.
- Patent Document 1 Japanese Laid-Open No. 2012-29793 describes a structure of an electronic blood pressure monitor including a pump which introduces air into a cuff attached to a measurement part of a person to be measured, a pump motor which drives the pump, and a substrate which controls the electronic blood pressure monitor.
- the substrate is disposed above the motor part of the pump motor, and a surface of the substrate on which the electronic components are mounted is disposed along a central axis of the shaft of the pump motor in the axial direction.
- An internal space of a housing of the electronic blood pressure monitor described in Patent Document 1 is wider than a size of the pump. Also, the other side of the substrate in the axial direction which is disposed above the pump part is disposed above the pump part in a state in which it protrudes from the other end of the pump part in the axial direction. Therefore, in the pump of the electronic blood pressure monitor described in Patent Document 1, the demand for miniaturization is lower than that of the electric oil pump.
- an electric oil pump including a motor part having a shaft disposed along a central axis extending in an axial direction, a pump part located on one side of the motor part in the axial direction and driven by the motor part via the shaft to discharge oil, and a control part which controls an operation of the motor part
- the motor part includes a rotor fixed to the other side of the shaft in the axial direction, a stator disposed to face the rotor, and a motor housing having a cylindrical portion which accommodates the rotor and the stator
- the pump part includes a pump rotor mounted on the shaft which protrudes from the motor part to one side in the axial direction, and a pump housing having an accommodating portion which accommodates the pump rotor
- the control part includes a plurality of electronic components, and a substrate having a surface on which the plurality of electronic components are mounted, the surface of the substrate is disposed radially outward from the cylindrical portion of the motor housing to face the motor housing and extend
- FIG. 1 is a cross-sectional view of an electric oil pump according to a first embodiment.
- FIG. 2 is an internal structural view of the electric oil pump in which illustration of a motor housing is omitted.
- FIG. 3 is a perspective view of an assembly main body portion.
- FIG. 4 is an internal structural view of the electric oil pump in which illustration of the motor housing and an assembly main body portion is omitted.
- FIG. 5 is a perspective view of a motor housing.
- FIG. 6 is a side view of the electric oil pump.
- FIG. 7 is a plan view of the electric oil pump.
- FIG. 8 is a rear view of the electric oil pump.
- the disclosure provides an electric oil pump having a substrate and capable of being downsized in an axial direction.
- an electric oil pump having a substrate and capable of being downsized in an axial direction.
- an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
- a Z axis direction is a direction (a right and left direction in FIG. 1 ) parallel to an axial direction of a central axis J shown in FIG. 1 .
- An X axis direction is a direction parallel to a short side direction of the electric oil pump shown in FIG. 1 , that is, a direction orthogonal to the paper surface of FIG. 1 .
- a Y axis direction is a direction orthogonal to both the X axis direction and the Z axis direction.
- a positive side (+Z side) in the Z axis direction is referred to as a “rear side,” and a negative side in the Z axis direction ( ⁇ Z side) is referred to as a “front side.”
- the rear side and the front side are simply used for explanation and do not limit an actual positional relationship and direction.
- the direction (the Z axis direction) parallel to the central axis J is simply referred to as an “axial direction,” a radial direction around the central axis J is simply referred to as a “radial direction,” and a circumferential direction around the central axis J, that is, an axial circumference (a ⁇ direction) of the central axis J is simply referred to as a “circumferential direction.”
- the term “extending in the axial direction” includes not only a case of strictly extending in the axial direction (the Z axis direction) but also a case of extending in a direction inclined in a range of less than 45° with respect to the axial direction.
- the term “extending in the radial direction” includes not only a case of strictly extending in the radial direction, that is, in a direction perpendicular to the axial direction (the Z axis direction) but also a case of extending in a direction inclined in a range of less than 45° with respect to the radial direction.
- FIG. 1 is a cross-sectional view of an electric oil pump according to a first embodiment.
- FIG. 2 is an internal structural view of the electric oil pump in which illustration of a motor housing is omitted.
- the electric oil pump 1 of the embodiment includes a motor part 10 , a pump part 40 , and a control part 82 .
- the motor part 10 has a shaft 11 disposed along the central axis J extending in the axial direction.
- the pump part 40 is located on one side (the front side) of the motor part 10 in the axial direction, is driven by the motor part 10 via the shaft 11 and discharges oil.
- the control part 82 is disposed on the +Y side of the motor part 10 and controls an operation of the motor part 10 .
- each element will be described in detail.
- the motor part 10 includes the shaft 11 , a rotor 20 , a stator 22 , a cylindrical portion 13 d of a motor housing 13 , and a coil 22 b.
- the motor part 10 is, for example, an inner rotor type motor.
- the rotor 20 is fixed to an outer circumferential surface of the shaft 11 , and the stator 22 is disposed radially outward from the rotor 20 .
- the rotor 20 is fixed to the other side (the rear side) of the shaft 11 in the axial direction.
- the stator 22 is disposed to face the rotor 20 .
- the motor housing 13 includes the cylindrical portion 13 d which has a cylindrical shape and covers the stator 22 , and a case 50 which extends from an outer surface of the cylindrical portion 13 d in a direction (the Y axis direction) orthogonal to the axial direction.
- the cylindrical portion 13 d accommodates the rotor 20 and the stator 22 .
- the motor housing 13 has a stator holding portion 13 a .
- the motor housing 13 is formed of a metal.
- the cylindrical portion 13 d and the case 50 are integrally molded. Therefore, the cylindrical portion 13 d and the case 50 are a single member.
- a motor cover 72 c is disposed at an end of the cylindrical portion 13 d on the other side (the rear side) in the axial direction, and a rear side opening of the cylindrical portion 13 d is closed by the motor cover 72 c . Further, the motor housing 13 has a bus bar assembly 30 which is connected to the coil 22 b extending from the stator 22 .
- the stator holding portion 13 a has a cylindrical shape which extends in the axial direction.
- the shaft 11 of the motor part 10 , the rotor 20 and the stator 22 are disposed in the stator holding portion 13 a .
- An outer surface of the stator 22 that is, an outer surface of a core back portion 22 a which will be described later is fitted to an inner surface 13 a 1 of the stator holding portion 13 a . Accordingly, the stator 22 is accommodated in the stator holding portion 13 a.
- FIG. 3 is a perspective view of an assembly main body portion.
- FIG. 4 is an internal structural view of the electric oil pump 1 in which illustration of the motor housing 13 and an assembly main body portion 33 is omitted.
- the bus bar assembly 30 is connected to a coil end 22 e of the coil 22 b extending from the stator 22 .
- a connecting bus bar 35 of the bus bar assembly 30 is connected to a bus bar 73 connected to a substrate 82 a . Therefore, the coil end 22 e is electrically connected to the substrate 82 a via the bus bar assembly 30 .
- the bus bar assembly 30 includes a plurality of connecting bus bars 35 which have a tubular shape and are connected to the coil ends 22 e , and the assembly main body portion 33 in which the connecting bus bars 35 are disposed.
- the connecting bus bar 35 is formed of a metal and is integrated with the assembly main body portion 33 by insert molding.
- the coil end 22 e protrudes from an end of the motor part 10 on the other side (the rear side) in the axial direction. Assuming that two coil ends 22 e which are adjacent to each other in the circumferential direction are one coil end group 22 f , three coil end groups 22 f are disposed at regular intervals in the circumferential direction. Therefore, the bus bar assembly 30 has three connecting bus bars 35 connected to the three coil end groups 22 f , respectively.
- the connecting bus bar 35 includes a bus bar main body portion 35 a curved on a radially outer side of the shaft 11 in the circumferential direction, a coil end side connection portion 35 b connected to one end portion of the bus bar main body portion 35 a and connected to the coil end 22 e , and a substrate-side connection portion 35 c connected to the other end of the bus bar main body portion 35 a and connected to the bus bar 73 connected to the substrate 82 a.
- the assembly main body portion 33 has a tubular portion 33 b which has a tubular shape and extends in a cylindrical shape.
- the tubular portion 33 b is open on one side (the front side) in the axial direction and has a bottom portion 33 a on the rear side.
- An insertion hole 33 c through which the shaft 11 passes is provided at a center portion of the bottom portion 33 a .
- An inner diameter of the insertion hole 33 c is larger than an outer diameter of the shaft 11 . Therefore, the insertion hole 33 c is capable of suppressing shaking of the rear side of the shaft 11 .
- the bus bar assembly 30 is fixed to the inner surface 13 a 1 of the cylindrical portion 13 d of the motor housing 13 . In the present embodiment, the bus bar assembly 30 is fixed to the inner surface 13 a 1 of the motor housing 13 by press fitting.
- the assembly main body portion 33 has a plurality of exposed through holes 33 d provided at regular intervals in a circumferential edge portion of the bottom portion 33 a of the assembly main body portion 33 in the circumferential direction.
- Each of the exposed through holes 33 d exposes the coil end side connection portion 35 b of the connecting bus bar 35 when seen in the axial direction.
- each of the exposed through holes 33 d has a long hole shape curved and extending in the circumferential direction when seen from the rear side.
- the assembly main body portion 33 has a female threaded portion 33 e for screwing a bolt between the exposed through holes 33 d which are the circumferential edge portion of the bottom portion 33 a and are adjacent to each other in the circumferential direction.
- the three female threaded portions 33 e are linearly disposed in the X axis direction when seen in the axial direction.
- Each of the female threaded portions 33 e has an insert.
- the bus bar 73 connects the connecting bus bar 35 with the substrate 82 a .
- the bus bar 73 includes a bus bar main body portion 73 a , a connecting bus bar side terminal portion 73 b provided on one end side of the bus bar main body portion 73 a and connected to the connecting bus bar 35 , and a substrate-side terminal portion 73 c provided on the other end side of the bus bar main body portion 73 a and connected to the substrate 82 a .
- the bus bar main body portion 73 a and the connecting bus bar side terminal portion 73 b linearly extend radially outward from the substrate-side connection portion 35 c of the connecting bus bar 35 .
- the other end side of the bus bar main body portion 73 a is bent toward the rear side and extends in the axial direction.
- the substrate-side connection portion 35 c is bent from the other end of the bus bar main body portion 35 a and linearly extends radially outward.
- the substrate-side connection portion 35 c is electrically connected through a through hole provided in the substrate 82 a.
- the rotor 20 is fixed to the rear side of the shaft 11 with respect to the pump part 40 .
- the rotor 20 has a rotor core 20 a and a rotor magnet 20 b .
- the rotor core 20 a surrounds the shaft 11 around the axis (in the ⁇ direction) and is fixed to the shaft 11 .
- the rotor magnet 20 b is fixed to an outer surface of the rotor core 20 a around the axis (in the ⁇ direction).
- the rotor core 20 a and the rotor magnet 20 b rotate together with the shaft 11 .
- the rotor 20 may be an embedded magnet type in which a permanent magnet is embedded in the rotor 20 .
- the embedded magnet type rotor 20 can reduce possibility that the magnet is separated by a centrifugal force and can positively use a reluctance torque, as compared with a surface magnet type in which the permanent magnet is provided on the surface of the rotor 20 .
- the stator 22 is disposed radially outward from the rotor 20 to face the rotor 20 , surrounds the rotor 20 around the axis (in the 0 direction) and rotates the rotor 20 around the central axis J.
- the stator 22 has a core back portion 22 a , a tooth portion 22 c , a coil 22 b , and an insulator (a bobbin) 22 d.
- the core back portion 22 a has a cylindrical shape which is concentric with the shaft 11 .
- the tooth portion 22 c extends from an inner surface of the core back portion 22 a toward the shaft 11 .
- a plurality of the tooth portions 22 c are provided and disposed at regular intervals in the circumferential direction of the inner surface of the core back portion 22 a .
- the coil 22 b is wound around the insulator 22 d .
- the insulator 22 d is mounted on each of the tooth portions 22 c.
- the shaft 11 extends around the central axis J extending in the axial direction and passes through the motor part 10 .
- the front side (the ⁇ Z side) of the shaft 11 protrudes from the motor part 10 and extends into the pump part 40 .
- the front side of the shaft 11 is fixed to an inner rotor 47 a of the pump part 40 .
- the front side of the shaft 11 passes through and is supported by a bearing through hole 50 a provided on the front side of the case 50 of the motor housing 13 . That is, the bearing through hole 50 a serves as a sliding bearing which rotatably supports the shaft 11 . Details of the bearing through hole 50 a will be described later.
- the rear side of the shaft 11 passes through the insertion hole 33 c of the bus bar assembly 30 , but the insertion hole 33 c does not serve as a bearing. Therefore, the rotor 20 rotates in a cantilever supported state in which only the front side thereof is supported.
- the control part 82 includes a plurality of electronic components 82 b and the substrate 82 a having a surface on which the plurality of electronic components 82 b are mounted.
- the control part 82 generates a signal for driving the motor part 10 and outputs the signal to the motor part 10 .
- the substrate 82 a is accommodated in the case 50 and is supported by and fixed to the bus bar assembly 75 extending radially outward from the cylindrical portion 13 d of the motor housing 13 .
- a rotation angle sensor 72 b which detects a rotation angle of the shaft 11 is disposed at a position which is inside the motor cover 72 c and faces a rear side end of the shaft 11 .
- the rotation angle sensor 72 b is mounted on a circuit board 72 a .
- the circuit board 72 a is supported by and fixed to a substrate support portion (not shown) fixed to a rear side end of the motor housing 13 .
- a rotation angle sensor magnet 72 d is disposed and fixed at the rear side end of the shaft 11 .
- the rotation angle sensor 72 b is disposed on the rear side of the rotation angle sensor magnet 72 d to face the rotation angle sensor magnet 72 d .
- the rotation angle sensor magnet 72 d When the shaft 11 rotates, the rotation angle sensor magnet 72 d also rotates, and thus a magnetic flux changes.
- the rotation angle sensor 72 b detects a change in the magnetic flux caused by rotation of the rotation angle sensor magnet 72 d and thus detects the rotation angle of the shaft 11 .
- the pump part 40 is located on one side (the front side) of the motor part 10 in the axial direction.
- the pump part 40 is driven by the motor part 10 via the shaft 11 .
- the pump part 40 includes a pump rotor 47 and a pump housing 51 .
- the pump housing 51 includes a pump body 52 and a pump cover 57 .
- the pump housing 51 has an accommodating portion 60 which accommodates the pump rotor 47 between the pump body 52 and the pump cover 57 .
- the pump body 52 is disposed at a front side end of the motor housing 13 .
- the pump body 52 is integrally molded with the case 50 . Therefore, the pump body 52 and the case 50 are the same member.
- the pump body 52 has a concave portion 54 which is recessed from an end surface 52 c thereof on the rear side (the +Z side) toward the front side (the ⁇ Z side).
- a seal member 59 is accommodated in the concave portion 54 .
- the seal member 59 seals oil leaking from the pump rotor 47 .
- the pump body 52 is the same member as the motor housing 13 .
- the pump body 52 has the bearing through hole 50 a passing therethrough along the central axis J.
- both ends thereof in the axial direction are open, the shaft 11 passes therethrough, an opening thereof on the rear side (the +Z side) is open in the concave portion 54 , and an opening thereof on the front side (the ⁇ Z side) is open in a front end surface 52 d of the pump body 52 .
- This bearing through hole 50 a is a sliding bearing which rotatably supports the shaft 11 .
- the pump rotor 47 is mounted on the front side of the shaft 11 .
- the pump rotor 47 includes an inner rotor 47 a , an outer rotor 47 b , and a rotor body 47 c .
- the pump rotor 47 is mounted on the shaft 11 . More specifically, the pump rotor 47 is mounted on the front side (the ⁇ Z side) of the shaft 11 .
- the inner rotor 47 a is fixed to the shaft 11 .
- the outer rotor 47 b surrounds the outer side of the inner rotor 47 a in the radial direction.
- the rotor body 47 c surrounds the outer side of the outer rotor 47 b in the radial direction.
- the rotor body 47 c is fixed to the pump body 52 .
- the inner rotor 47 a has an annular shape.
- the inner rotor 47 a is a gear having teeth on a radially outer side surface thereof.
- the inner rotor 47 a rotates around the axis (in the ⁇ direction) together with the shaft 11 .
- the outer rotor 47 b has an annular shape which surrounds a radially outer side of the inner rotor 47 a .
- the outer rotor 47 b is a gear having teeth on a radially inner surface thereof.
- a radially outer side surface of the outer rotor 47 b has a circular shape.
- a radially inner side surface of the rotor body 47 c has a circular shape.
- the motor part 10 and the pump part 40 have the same rotation axis. Accordingly, it is possible to suppress a size of the electric oil pump 1 from increasing in the axial direction.
- a suction port (not shown) of the pump cover 57 is disposed on the front side of the negative pressure region of the pump rotor 47 . Further, a discharge port (not shown) of the pump cover 57 is disposed on the front side of the pressurization region of the pump rotor 47 .
- the pump cover 57 is mounted on the front side of the pump rotor 47 .
- the pump cover 57 is fixed to the rotor body 47 c of the pump rotor 47 .
- the pump cover 57 is mounted on and fixed to the pump body 52 together with the rotor body 47 c of the pump rotor 47 .
- the pump cover 57 has an inlet 41 (refer to FIG. 2 ) connected to the suction port.
- the pump cover 57 has an outlet 42 (refer to FIG. 2 ) connected to the discharge port.
- Oil suctioned into the pump rotor 47 from the inlet 41 provided in the pump cover 57 via the suction port of the pump cover 57 is accommodated in a volume portion between the inner rotor 47 a and the outer rotor 47 b and is delivered to the pressurization region. Thereafter, the oil is discharged from the outlet 42 provided in the pump cover 57 via the discharge port of the pump cover 57 .
- a suction direction in the inlet 41 and a discharge direction in the outlet 42 are orthogonal to each other. Accordingly, it is possible to reduce a pressure loss from the inlet to the outlet and to make a flow of the oil smooth.
- the inlet is disposed on the side in which the substrate 82 a is disposed with respect to the motor part 10 .
- FIG. 5 is a perspective view of the motor housing 13 .
- the motor housing 13 includes the cylindrical portion 13 d and the case 50 .
- the motor housing 13 is formed in a rectangular parallelepiped shape and has the cylindrical portion 13 d extending in the axial direction thereof.
- the cylindrical portion 13 d has the end surface 52 c in which the rear side thereof is open and the front side thereof is closed. Therefore, the cylindrical portion 13 d is a cylinder having a bottom.
- the bearing through hole 50 a which is formed in the axial direction and through which the shaft 11 passes is provided in the end surface 52 c.
- the case 50 is a portion of the motor housing 13 outside the cylindrical portion 13 d .
- the case 50 has a substrate accommodating portion 84 which is located radially outward from the cylindrical portion 13 d , extends in the axial direction and accommodates the substrate 82 a .
- the assembly 45 refers to a combination of the motor part 10 and the pump part 40 .
- the substrate accommodating portion 84 has a placing surface portion 84 a which is disposed within an axial range of an assembly 45 to face the cylindrical portion 13 d and on which the substrate 82 a is placed. In the embodiment, the substrate accommodating portion 84 is located on the +Y side from the cylindrical portion 13 d , and the placing surface portion 84 a is disposed to face the cylindrical portion 13 d .
- the placing surface portion 84 a extends in the axial direction and the X axis direction. That is, the placing surface portion 84 a extends in a direction orthogonal to the Y axis direction. Therefore, it is possible to suppress an increase in the size of the electric oil pump 1 in the Y axis direction.
- the substrate accommodating portion 84 is in the form of a bottomed container which is recessed toward the cylindrical portion 13 d and includes the placing surface portion 84 a which extends in a planar shape in the axial direction and an annular protruding portion 84 b which protrudes toward the +Y side from a circumferential edge portion of the placing surface portion 84 a .
- the placing surface portion 84 a has a rectangular shape as seen in a direction of the ⁇ Y side.
- the substrate 82 a is accommodated in the substrate accommodating portion 84 .
- a surface of the substrate 82 a is disposed on a radially outer side of the cylindrical portion 13 d of the motor housing 13 to face the cylindrical portion 13 d of the motor housing 13 and extends in the axial direction. Further, the substrate 82 a has an axial length shorter than an axial length of the assembly 45 formed by combining the motor part 10 and the pump part 40 and is disposed within an axial range of the assembly 45 . In the embodiment, the substrate 82 a is formed in a rectangular shape and has a similar shape smaller than the placing surface portion 84 a of the substrate accommodating portion 84 .
- the surface 82 c of the substrate 82 a is disposed along the placing surface portion 84 a of the substrate accommodating portion 84 . Therefore, the surface 82 c of the substrate 82 a is disposed to face the cylindrical portion 13 d of the motor housing 13 . Also, in the substrate 82 a , a front side end of the substrate 82 a is located on the front side of the assembly 45 , and a rear side end of the substrate 82 a is located on the rear side of the assembly 45 . Therefore, the axial length of the substrate 82 a is shorter than the axial length of the assembly 45 , and the substrate 82 a is disposed within the axial range of the assembly 45 . Accordingly, a length of the electric oil pump 1 in the axial direction is suppressed, and the size thereof can be reduced.
- the substrate 82 a has the surface 82 c on which the plurality of electronic components 82 b are mounted.
- the substrate 82 a is formed in a plate shape and has planar surfaces 82 c on both sides thereof in the Y axis direction.
- the electronic components 82 b are mounted on these surfaces 82 c .
- the plurality of electronic components 82 b mounted on the substrate 82 a are disposed on the substrate 82 a to face the cylindrical portion 13 d of the motor housing 13 .
- the electronic components 82 b are disposed in the Y axis direction.
- an electronic component 82 b 1 having a relatively high height is mounted on a front side surface 82 c 2 of the surfaces 82 c of the substrate 82 a opposite to a rear side surface 82 c 1 facing the motor part 10 .
- the electronic component 82 b 1 having a relatively high height is a capacitor.
- the electronic component 82 b 1 having a relatively high height may be a choke coil. Therefore, it is possible to increase a distance between the motor part 10 and the electronic component 82 b 1 having a relatively high height. Thus, adverse influence on the electronic component 82 b 1 due to heat generation from the motor part 10 can be suppressed.
- a connector portion 82 d electrically connected to the substrate 82 a is provided on one side (the front side) of the substrate 82 a in the axial direction.
- the bus bar 73 of the bus bar assembly 75 is electrically connected to the other side (the rear side) of the substrate 82 a in the axial direction.
- the connector portion 82 d is a connection terminal.
- the connector portion 82 d extends from the front side surface 82 c 2 of the front side end of the substrate 82 a in the Y axis direction.
- a plurality of the connector portions 82 d are disposed at intervals in the X axis direction. That is, the connector portions 82 d have a plurality of connection terminals.
- the connector portions 82 d may be disposed at positions away from a connection point in which the bus bar 73 is connected to the substrate 82 a . Therefore, it is possible to suppress the possibility that noise generated from the bus bar 73 adversely affects the connector portions 82 d.
- FIG. 6 is a side view of the electric oil pump.
- a substrate cover 61 is disposed in an opening of the substrate accommodating portion 84 and closes the opening of the substrate accommodating portion 84 .
- the substrate cover 61 is disposed parallel to the substrate 82 a . Therefore, the electric oil pump 1 can be downsized in a direction (the Y direction) orthogonal to the axial direction.
- the substrate cover 61 has a plurality of fixing portions 85 fixed to the case 50 . In the embodiment, the fixing portions 85 are bolts.
- FIG. 7 is a plan view of the electric oil pump 1 .
- the electric oil pump 1 is mounted on a mounting surface 90 b provided on a lower surface 90 a of a transmission 90 .
- the electric oil pump 1 is accommodated in an oil pan 93 provided below the transmission 90 .
- the electric oil pump 1 suctions oil in the oil pan 93 from the inlet 41 and discharges it from the outlet 42 .
- the case 50 of the electric oil pump 1 has a plurality of mounting portions 63 to be attached to the mounting surface 90 b of the transmission 90 .
- the mounting portions 63 are provided at a corner portion of the case 50 as seen in a ⁇ X side direction.
- Each of the mounting portions 63 has a mounting through hole 64 in a center thereof.
- a bolt (not shown) passes through the mounting through hole 64 , and the electric oil pump 1 is mounted on the mounting surface 90 b of the transmission 90 using this bolt.
- Each of the mounting portions 63 has a flat surface portion 63 a which comes into contact with the mounting surface 90 b when the electric oil pump 1 is mounted on the mounting surface 90 b.
- FIG. 8 is a rear view of the electric oil pump 1 .
- the case 50 has a plurality of radiation fins 86 which extend radially outward from the outer surface of the cylindrical portion 13 d of the motor housing 13 and extend in a direction intersecting the axial direction.
- the plurality of radiation fins 86 protrude in the X axis direction and extend in the Y axis direction on both +X side and ⁇ X side of the outer surface of the cylindrical portion 13 d of the motor housing 13 .
- the plurality of radiation fins 86 are disposed at intervals in the axial direction.
- Radiation fins 86 a provided on the +X side of the outer surface of the cylindrical portion 13 d of the motor housing 13 and radiation fins 86 b provided on the ⁇ X side thereof are disposed on the same plane in the X axis direction. Therefore, the radiation fins 86 a and 86 b extending radially outward from the cylindrical portion 13 d are connected in the X axis direction. Heat from the substrate 82 a and the motor part 10 can be dissipated by these radiation fins 86 .
- the case 50 has a support portion 77 which extends radially outward from the outer surface of the cylindrical portion 13 d of the motor housing 13 and connects a pair of radiation fins 86 adjacent to each other in the axial direction.
- the support portion 77 is provided between a pair of radiation fins 86 which extend radially outward from the outer surface of the cylindrical portion 13 d of the motor housing 13 and are adjacent to each other in the axial direction.
- the support portion 77 extends between the pair of radiation fins 86 in a plate shape in a direction (the Y axis direction) orthogonal to the axial direction.
- the support portion 77 has an inter-fin through hole 78 which extends in a direction intersecting the flat surface portion 63 a of the mounting portion 63 and passes through the support portion 77 .
- the inter-fin through hole 78 extends in a direction orthogonal to the flat surface portion 63 a . Therefore, when the mounting portion 63 is mounted on the mounting surface 90 b of the transmission 90 , the inter-fin through hole 78 can be oriented in a vertical direction. Accordingly, it is possible to easily allow the oil to flow downward through the inter-fin through hole 78 .
- the case 50 has a rib 88 which connects the pair of radiation fins 86 adjacent to each other in the axial direction.
- the rib 88 extends between the pair of radiation fins 86 adjacent to each other in the axial direction from the outer surface of the cylindrical portion 13 d of the motor housing 13 in the X axis direction.
- the radiation fins 86 are connected to the other radiation fins 86 adjacent to each other in the axial direction via the ribs 88 and also connected to the cylindrical portion 13 d . Therefore, the plurality of radiation fins 86 can further enhance rigidity through the ribs 88 .
- the surface 82 c of the substrate 82 a is disposed on the radially outer side of the cylindrical portion 13 d of the motor housing 13 to face the cylindrical portion 13 d of the motor housing 13 and extends in the axial direction.
- the substrate 82 a has the axial length shorter than the axial length of the assembly 45 formed by combining the motor part 10 and the pump part 40 and is thus disposed within the axial range of the assembly 45 . Therefore, the substrate 82 a does not protrude axially outward from the electric oil pump 1 in the axial direction. Further, the size of the substrate 82 a protruding radially outward from the motor part 10 can be suppressed. Therefore, the electric oil pump 1 can be downsized.
- the plurality of electronic components 82 b mounted on the substrate 82 a are disposed on the substrate 82 a to face the motor housing 13 . Therefore, the plurality of electronic components 82 b can be disposed compactly on the substrate 82 a in the axial direction. Thus, the axial length of the substrate 82 a can be further shortened.
- the electronic component 82 b 1 having a relatively high height is mounted on the front side surface 82 c 2 opposite to the rear side surface 82 c 1 of the substrate 82 a facing the motor part 10 side. Therefore, it is possible to increase a distance between the motor part 10 and the electronic component 82 b 1 having the relatively high height. Thus, it is possible to suppress an adverse effect due to heat generation from the motor part 10 on the electronic component 82 b 1 having the relatively high height.
- the connector portion 82 d electrically connected to the substrate 82 a is provided on one side of the substrate 82 a in the axial direction, and the bus bar 73 connected to the connecting bus bar 35 is electrically connected to the other side of the substrate 82 a in the axial direction. Therefore, the connector portion 82 d can be disposed at a position away from a connection point in which the bus bar 73 is connected to the substrate 82 a . Thus, it is possible to suppress the possibility that noise generated from the bus bar 73 adversely affects the connector portion 82 d.
- the substrate accommodating portion 84 has the placing surface portion 84 a which is disposed in the axial range of the assembly 45 to face the cylindrical portion 13 d and on which the substrate 82 a is placed.
- the arrangement of the substrate 82 a with respect to the assembly 45 can be facilitated by disposing the substrate 82 a in the substrate accommodating portion 84 .
- the case 50 has the plurality of radiation fins 86 which extend radially outward from the outer surface of the cylindrical portion 13 d and extend in a direction intersecting the axial direction. Therefore, since the case 50 has the plurality of radiation fins 86 , it is possible to increase an area of a portion in which heat is radiated. Thus, it is possible to effectively dissipate the heat generated from the motor part 10 and the heat generated from the substrate 82 a via the radiation fins 86 .
- the case 50 has the support portion 77 which extends radially outward from the outer surface of the cylindrical portion 13 d of the motor housing 13 and connects a pair of radiation fins 86 adjacent to each other in the axial direction. Therefore, since the plurality of radiating fins 86 are integrally connected via the support portion 77 , the rigidity of the plurality of radiation fins 86 can be improved.
- the case 50 has the plurality of mounting portions 63 mounted on the mounting surface 90 b provided in the transmission 90 of a vehicle. Therefore, the electric oil pump 1 can be mounted in the transmission 90 by mounting the mounting portion 63 to the mounting surface 90 b of the transmission 90 .
- each of the plurality of mounting portions 63 has the flat surface portion 63 a which is in surface contact with the mounting surface 90 b , the mounting portion 63 can be mounted on the mounting surface 90 b in a state in which the flat surface portion 63 a is in surface contact with the mounting surface 90 b . Therefore, it is possible to firmly mount the electric oil pump 1 in the transmission 90 .
- the support portion 77 has the inter-fin through hole 78 which extends in a direction intersecting the flat surface portion 63 a and passes through the support portion 77 . Therefore, even when a liquid such as oil tries to be stored between the radiation fins 68 , it is possible to discharge the liquid to the outside of the electric oil pump 1 via the inter-fin through hole 78 .
- the plurality of radiating fins 86 are disposed at intervals in the axial direction, and the case 50 has the ribs 88 which connects a pair of radiation fins 86 adjacent to each other in the axial direction. Therefore, the plurality of radiation fins 86 can further enhance the rigidity through the ribs 88 .
- the electronic component 82 b 1 having the relatively high height is a capacitor or a choke coil. Therefore, it is possible to suppress the influence of heat generation from the motor part 10 on the capacitor or the choke coil.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
- This application claims the priority benefit of Japan Application No. 2018-069199, filed on Mar. 30, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
- The disclosure relates to an electric oil pump.
- An electric oil pump having a structure including a pump part, a motor part for driving the pump part, and a control part for controlling an operation of the motor part is known. In this electric oil pump, for example, the pump part is disposed on one side of the motor part in the axial direction, and a shaft extending from the motor part passes through a pump body of the pump part. An accommodating portion which is open on one side of the pump body in the axial direction and recessed toward the other side in the axial direction is provided in an end surface of the pump body on one side in the axial direction. A pump rotor is accommodated in the accommodating portion. Further, the control part has a substrate on which electronic components for driving the motor part are mounted.
- Patent Document 1 (Japanese Laid-Open No. 2012-29793) describes a structure of an electronic blood pressure monitor including a pump which introduces air into a cuff attached to a measurement part of a person to be measured, a pump motor which drives the pump, and a substrate which controls the electronic blood pressure monitor. The substrate is disposed above the motor part of the pump motor, and a surface of the substrate on which the electronic components are mounted is disposed along a central axis of the shaft of the pump motor in the axial direction.
- An internal space of a housing of the electronic blood pressure monitor described in
Patent Document 1 is wider than a size of the pump. Also, the other side of the substrate in the axial direction which is disposed above the pump part is disposed above the pump part in a state in which it protrudes from the other end of the pump part in the axial direction. Therefore, in the pump of the electronic blood pressure monitor described inPatent Document 1, the demand for miniaturization is lower than that of the electric oil pump. - On the other hand, for example, in an electric oil pump applied to a vehicle, the demand for miniaturization is high so as to ensure a minimum ground clearance of the vehicle. Therefore, when the pump and the substrate in the electronic blood pressure monitor described in
Patent Document 1 are applied to the electric oil pump, a size of the electric oil pump may be increased. - According to an exemplary embodiment of the disclosure, there is provided an electric oil pump including a motor part having a shaft disposed along a central axis extending in an axial direction, a pump part located on one side of the motor part in the axial direction and driven by the motor part via the shaft to discharge oil, and a control part which controls an operation of the motor part, wherein the motor part includes a rotor fixed to the other side of the shaft in the axial direction, a stator disposed to face the rotor, and a motor housing having a cylindrical portion which accommodates the rotor and the stator, the pump part includes a pump rotor mounted on the shaft which protrudes from the motor part to one side in the axial direction, and a pump housing having an accommodating portion which accommodates the pump rotor, the control part includes a plurality of electronic components, and a substrate having a surface on which the plurality of electronic components are mounted, the surface of the substrate is disposed radially outward from the cylindrical portion of the motor housing to face the motor housing and extends in the axial direction, and the substrate has an axial length shorter than an axial length of an assembly formed by combining the motor part and the pump part and is disposed within an axial range of the assembly.
-
FIG. 1 is a cross-sectional view of an electric oil pump according to a first embodiment. -
FIG. 2 is an internal structural view of the electric oil pump in which illustration of a motor housing is omitted. -
FIG. 3 is a perspective view of an assembly main body portion. -
FIG. 4 is an internal structural view of the electric oil pump in which illustration of the motor housing and an assembly main body portion is omitted. -
FIG. 5 is a perspective view of a motor housing. -
FIG. 6 is a side view of the electric oil pump. -
FIG. 7 is a plan view of the electric oil pump. -
FIG. 8 is a rear view of the electric oil pump. - The disclosure provides an electric oil pump having a substrate and capable of being downsized in an axial direction.
- According to the exemplary embodiment of the disclosure, it is possible to provide an electric oil pump having a substrate and capable of being downsized in an axial direction.
- Hereinafter, an electric oil pump according to an embodiment of the disclosure will be described with reference to the drawings. In the embodiment, an electric oil pump which supplies oil to a transmission mounted in a vehicle such as an automobile will be described. Further, in the following drawings, to make each configuration easy to understand, the actual structure and the scale and number in each structure may be different from each other.
- Further, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, a Z axis direction is a direction (a right and left direction in
FIG. 1 ) parallel to an axial direction of a central axis J shown inFIG. 1 . An X axis direction is a direction parallel to a short side direction of the electric oil pump shown inFIG. 1 , that is, a direction orthogonal to the paper surface ofFIG. 1 . A Y axis direction is a direction orthogonal to both the X axis direction and the Z axis direction. - Further, in the following description, a positive side (+Z side) in the Z axis direction is referred to as a “rear side,” and a negative side in the Z axis direction (−Z side) is referred to as a “front side.” The rear side and the front side are simply used for explanation and do not limit an actual positional relationship and direction. Also, unless otherwise noted, the direction (the Z axis direction) parallel to the central axis J is simply referred to as an “axial direction,” a radial direction around the central axis J is simply referred to as a “radial direction,” and a circumferential direction around the central axis J, that is, an axial circumference (a θ direction) of the central axis J is simply referred to as a “circumferential direction.”
- In the specification, the term “extending in the axial direction” includes not only a case of strictly extending in the axial direction (the Z axis direction) but also a case of extending in a direction inclined in a range of less than 45° with respect to the axial direction. Also, in the specification, the term “extending in the radial direction” includes not only a case of strictly extending in the radial direction, that is, in a direction perpendicular to the axial direction (the Z axis direction) but also a case of extending in a direction inclined in a range of less than 45° with respect to the radial direction.
-
FIG. 1 is a cross-sectional view of an electric oil pump according to a first embodiment.FIG. 2 is an internal structural view of the electric oil pump in which illustration of a motor housing is omitted. As shown inFIGS. 1 and 2 , theelectric oil pump 1 of the embodiment includes amotor part 10, apump part 40, and acontrol part 82. Themotor part 10 has ashaft 11 disposed along the central axis J extending in the axial direction. Thepump part 40 is located on one side (the front side) of themotor part 10 in the axial direction, is driven by themotor part 10 via theshaft 11 and discharges oil. Thecontrol part 82 is disposed on the +Y side of themotor part 10 and controls an operation of themotor part 10. Hereinafter, each element will be described in detail. - <
Motor Part 10> - As shown in
FIG. 1 , themotor part 10 includes theshaft 11, arotor 20, astator 22, acylindrical portion 13 d of amotor housing 13, and acoil 22 b. - The
motor part 10 is, for example, an inner rotor type motor. Therotor 20 is fixed to an outer circumferential surface of theshaft 11, and thestator 22 is disposed radially outward from therotor 20. Therotor 20 is fixed to the other side (the rear side) of theshaft 11 in the axial direction. Thestator 22 is disposed to face therotor 20. - (Motor Housing 13)
- As shown in
FIG. 1 , themotor housing 13 includes thecylindrical portion 13 d which has a cylindrical shape and covers thestator 22, and acase 50 which extends from an outer surface of thecylindrical portion 13 d in a direction (the Y axis direction) orthogonal to the axial direction. Thecylindrical portion 13 d accommodates therotor 20 and thestator 22. Themotor housing 13 has astator holding portion 13 a. Themotor housing 13 is formed of a metal. Thecylindrical portion 13 d and thecase 50 are integrally molded. Therefore, thecylindrical portion 13 d and thecase 50 are a single member. Amotor cover 72 c is disposed at an end of thecylindrical portion 13 d on the other side (the rear side) in the axial direction, and a rear side opening of thecylindrical portion 13 d is closed by themotor cover 72 c. Further, themotor housing 13 has abus bar assembly 30 which is connected to thecoil 22 b extending from thestator 22. - (
Stator Holding Portion 13 a) - The
stator holding portion 13 a has a cylindrical shape which extends in the axial direction. Theshaft 11 of themotor part 10, therotor 20 and thestator 22 are disposed in thestator holding portion 13 a. An outer surface of thestator 22, that is, an outer surface of a core backportion 22 a which will be described later is fitted to aninner surface 13 a 1 of thestator holding portion 13 a. Accordingly, thestator 22 is accommodated in thestator holding portion 13 a. - (Bus Bar Assembly 30)
-
FIG. 3 is a perspective view of an assembly main body portion.FIG. 4 is an internal structural view of theelectric oil pump 1 in which illustration of themotor housing 13 and an assemblymain body portion 33 is omitted. As shown inFIGS. 3 and 4 , thebus bar assembly 30 is connected to acoil end 22 e of thecoil 22 b extending from thestator 22. A connectingbus bar 35 of thebus bar assembly 30 is connected to abus bar 73 connected to asubstrate 82 a. Therefore, thecoil end 22 e is electrically connected to thesubstrate 82 a via thebus bar assembly 30. - The
bus bar assembly 30 includes a plurality of connectingbus bars 35 which have a tubular shape and are connected to the coil ends 22 e, and the assemblymain body portion 33 in which the connectingbus bars 35 are disposed. In the embodiment, the connectingbus bar 35 is formed of a metal and is integrated with the assemblymain body portion 33 by insert molding. - The
coil end 22 e protrudes from an end of themotor part 10 on the other side (the rear side) in the axial direction. Assuming that two coil ends 22 e which are adjacent to each other in the circumferential direction are onecoil end group 22 f, threecoil end groups 22 f are disposed at regular intervals in the circumferential direction. Therefore, thebus bar assembly 30 has three connectingbus bars 35 connected to the threecoil end groups 22 f, respectively. - (Connecting Bus Bar 35)
- The connecting
bus bar 35 includes a bus barmain body portion 35 a curved on a radially outer side of theshaft 11 in the circumferential direction, a coil endside connection portion 35 b connected to one end portion of the bus barmain body portion 35 a and connected to thecoil end 22 e, and a substrate-side connection portion 35 c connected to the other end of the bus barmain body portion 35 a and connected to thebus bar 73 connected to thesubstrate 82 a. - (Assembly Main Body Portion 33)
- As shown in
FIGS. 1 and 3 , the assemblymain body portion 33 has atubular portion 33 b which has a tubular shape and extends in a cylindrical shape. Thetubular portion 33 b is open on one side (the front side) in the axial direction and has abottom portion 33 a on the rear side. Aninsertion hole 33 c through which theshaft 11 passes is provided at a center portion of thebottom portion 33 a. An inner diameter of theinsertion hole 33 c is larger than an outer diameter of theshaft 11. Therefore, theinsertion hole 33 c is capable of suppressing shaking of the rear side of theshaft 11. Thebus bar assembly 30 is fixed to theinner surface 13 a 1 of thecylindrical portion 13 d of themotor housing 13. In the present embodiment, thebus bar assembly 30 is fixed to theinner surface 13 a 1 of themotor housing 13 by press fitting. - As shown in
FIG. 3 , the assemblymain body portion 33 has a plurality of exposed throughholes 33 d provided at regular intervals in a circumferential edge portion of thebottom portion 33 a of the assemblymain body portion 33 in the circumferential direction. Each of the exposed throughholes 33 d exposes the coil endside connection portion 35 b of the connectingbus bar 35 when seen in the axial direction. In the embodiment, each of the exposed throughholes 33 d has a long hole shape curved and extending in the circumferential direction when seen from the rear side. - The assembly
main body portion 33 has a female threadedportion 33 e for screwing a bolt between the exposed throughholes 33 d which are the circumferential edge portion of thebottom portion 33 a and are adjacent to each other in the circumferential direction. In the embodiment, the three female threadedportions 33 e are linearly disposed in the X axis direction when seen in the axial direction. Each of the female threadedportions 33 e has an insert. - (Bus Bar 73)
- As shown in
FIG. 4 , thebus bar 73 connects the connectingbus bar 35 with thesubstrate 82 a. Thebus bar 73 includes a bus barmain body portion 73 a, a connecting bus barside terminal portion 73 b provided on one end side of the bus barmain body portion 73 a and connected to the connectingbus bar 35, and a substrate-side terminal portion 73 c provided on the other end side of the bus barmain body portion 73 a and connected to thesubstrate 82 a. The bus barmain body portion 73 a and the connecting bus barside terminal portion 73 b linearly extend radially outward from the substrate-side connection portion 35 c of the connectingbus bar 35. The other end side of the bus barmain body portion 73 a is bent toward the rear side and extends in the axial direction. The substrate-side connection portion 35 c is bent from the other end of the bus barmain body portion 35 a and linearly extends radially outward. The substrate-side connection portion 35 c is electrically connected through a through hole provided in thesubstrate 82 a. - (Rotor 20)
- As shown in
FIG. 1 , therotor 20 is fixed to the rear side of theshaft 11 with respect to thepump part 40. Therotor 20 has arotor core 20 a and arotor magnet 20 b. Therotor core 20 a surrounds theshaft 11 around the axis (in the θ direction) and is fixed to theshaft 11. Therotor magnet 20 b is fixed to an outer surface of therotor core 20 a around the axis (in the θ direction). Therotor core 20 a and therotor magnet 20 b rotate together with theshaft 11. Incidentally, therotor 20 may be an embedded magnet type in which a permanent magnet is embedded in therotor 20. The embeddedmagnet type rotor 20 can reduce possibility that the magnet is separated by a centrifugal force and can positively use a reluctance torque, as compared with a surface magnet type in which the permanent magnet is provided on the surface of therotor 20. - (Stator 22)
- The
stator 22 is disposed radially outward from therotor 20 to face therotor 20, surrounds therotor 20 around the axis (in the 0 direction) and rotates therotor 20 around the central axis J. Thestator 22 has a core backportion 22 a, atooth portion 22 c, acoil 22 b, and an insulator (a bobbin) 22 d. - The core back
portion 22 a has a cylindrical shape which is concentric with theshaft 11. Thetooth portion 22 c extends from an inner surface of the core backportion 22 a toward theshaft 11. A plurality of thetooth portions 22 c are provided and disposed at regular intervals in the circumferential direction of the inner surface of the core backportion 22 a. Thecoil 22 b is wound around theinsulator 22 d. Theinsulator 22 d is mounted on each of thetooth portions 22 c. - (Shaft 11)
- As shown in
FIG. 1 , theshaft 11 extends around the central axis J extending in the axial direction and passes through themotor part 10. The front side (the −Z side) of theshaft 11 protrudes from themotor part 10 and extends into thepump part 40. The front side of theshaft 11 is fixed to aninner rotor 47 a of thepump part 40. The front side of theshaft 11 passes through and is supported by a bearing throughhole 50 a provided on the front side of thecase 50 of themotor housing 13. That is, the bearing throughhole 50 a serves as a sliding bearing which rotatably supports theshaft 11. Details of the bearing throughhole 50 a will be described later. - The rear side of the
shaft 11 passes through theinsertion hole 33 c of thebus bar assembly 30, but theinsertion hole 33 c does not serve as a bearing. Therefore, therotor 20 rotates in a cantilever supported state in which only the front side thereof is supported. - <
Control Part 82> - As shown in
FIGS. 1 and 2 , thecontrol part 82 includes a plurality ofelectronic components 82 b and thesubstrate 82 a having a surface on which the plurality ofelectronic components 82 b are mounted. Thecontrol part 82 generates a signal for driving themotor part 10 and outputs the signal to themotor part 10. Thesubstrate 82 a is accommodated in thecase 50 and is supported by and fixed to thebus bar assembly 75 extending radially outward from thecylindrical portion 13 d of themotor housing 13. - As shown in
FIG. 1 , arotation angle sensor 72 b which detects a rotation angle of theshaft 11 is disposed at a position which is inside themotor cover 72 c and faces a rear side end of theshaft 11. Therotation angle sensor 72 b is mounted on acircuit board 72 a. Thecircuit board 72 a is supported by and fixed to a substrate support portion (not shown) fixed to a rear side end of themotor housing 13. A rotationangle sensor magnet 72 d is disposed and fixed at the rear side end of theshaft 11. Therotation angle sensor 72 b is disposed on the rear side of the rotationangle sensor magnet 72 d to face the rotationangle sensor magnet 72 d. When theshaft 11 rotates, the rotationangle sensor magnet 72 d also rotates, and thus a magnetic flux changes. Therotation angle sensor 72 b detects a change in the magnetic flux caused by rotation of the rotationangle sensor magnet 72 d and thus detects the rotation angle of theshaft 11. - <
Pump Part 40> - As shown in
FIG. 1 , thepump part 40 is located on one side (the front side) of themotor part 10 in the axial direction. Thepump part 40 is driven by themotor part 10 via theshaft 11. Thepump part 40 includes apump rotor 47 and apump housing 51. In the embodiment, thepump housing 51 includes apump body 52 and apump cover 57. Thepump housing 51 has anaccommodating portion 60 which accommodates thepump rotor 47 between thepump body 52 and thepump cover 57. Each part will be described in detail below. - (Pump Body 52)
- As shown in
FIG. 1 , thepump body 52 is disposed at a front side end of themotor housing 13. Thepump body 52 is integrally molded with thecase 50. Therefore, thepump body 52 and thecase 50 are the same member. Thepump body 52 has aconcave portion 54 which is recessed from anend surface 52 c thereof on the rear side (the +Z side) toward the front side (the −Z side). Aseal member 59 is accommodated in theconcave portion 54. Theseal member 59 seals oil leaking from thepump rotor 47. Thepump body 52 is the same member as themotor housing 13. - The
pump body 52 has the bearing throughhole 50 a passing therethrough along the central axis J. In the bearing throughhole 50 a, both ends thereof in the axial direction are open, theshaft 11 passes therethrough, an opening thereof on the rear side (the +Z side) is open in theconcave portion 54, and an opening thereof on the front side (the −Z side) is open in afront end surface 52 d of thepump body 52. This bearing throughhole 50 a is a sliding bearing which rotatably supports theshaft 11. - (Pump Rotor 47)
- As shown in
FIG. 1 , thepump rotor 47 is mounted on the front side of theshaft 11. Thepump rotor 47 includes aninner rotor 47 a, anouter rotor 47 b, and arotor body 47 c. Thepump rotor 47 is mounted on theshaft 11. More specifically, thepump rotor 47 is mounted on the front side (the −Z side) of theshaft 11. Theinner rotor 47 a is fixed to theshaft 11. Theouter rotor 47 b surrounds the outer side of theinner rotor 47 a in the radial direction. Therotor body 47 c surrounds the outer side of theouter rotor 47 b in the radial direction. Therotor body 47 c is fixed to thepump body 52. - The
inner rotor 47 a has an annular shape. Theinner rotor 47 a is a gear having teeth on a radially outer side surface thereof. Theinner rotor 47 a rotates around the axis (in the θ direction) together with theshaft 11. Theouter rotor 47 b has an annular shape which surrounds a radially outer side of theinner rotor 47 a. Theouter rotor 47 b is a gear having teeth on a radially inner surface thereof. A radially outer side surface of theouter rotor 47 b has a circular shape. A radially inner side surface of therotor body 47 c has a circular shape. - The gear on the radially outer side surface of the
inner rotor 47 a and the gear on the radially inner side surface of theouter rotor 47 b engage with each other, and theinner rotor 47 a is rotated by theshaft 11, and thus theouter rotor 47 b rotates. That is, thepump rotor 47 is rotated by the rotation of theshaft 11. In other words, themotor part 10 and thepump part 40 have the same rotation axis. Accordingly, it is possible to suppress a size of theelectric oil pump 1 from increasing in the axial direction. - Also, as the
inner rotor 47 a and theouter rotor 47 b rotate, a volume between engagement portions of theinner rotor 47 a and theouter rotor 47 b changes. A region in which the volume decreases becomes a pressurization region, and a region in which the volume increases is a negative pressure region. A suction port (not shown) of thepump cover 57 is disposed on the front side of the negative pressure region of thepump rotor 47. Further, a discharge port (not shown) of thepump cover 57 is disposed on the front side of the pressurization region of thepump rotor 47. - (Pump Cover 57)
- As shown in
FIG. 1 , thepump cover 57 is mounted on the front side of thepump rotor 47. Thepump cover 57 is fixed to therotor body 47 c of thepump rotor 47. Thepump cover 57 is mounted on and fixed to thepump body 52 together with therotor body 47 c of thepump rotor 47. Thepump cover 57 has an inlet 41 (refer toFIG. 2 ) connected to the suction port. Thepump cover 57 has an outlet 42 (refer toFIG. 2 ) connected to the discharge port. - Oil suctioned into the
pump rotor 47 from theinlet 41 provided in thepump cover 57 via the suction port of thepump cover 57 is accommodated in a volume portion between theinner rotor 47 a and theouter rotor 47 b and is delivered to the pressurization region. Thereafter, the oil is discharged from theoutlet 42 provided in thepump cover 57 via the discharge port of thepump cover 57. A suction direction in theinlet 41 and a discharge direction in theoutlet 42 are orthogonal to each other. Accordingly, it is possible to reduce a pressure loss from the inlet to the outlet and to make a flow of the oil smooth. - As shown in
FIG. 2 , the inlet is disposed on the side in which thesubstrate 82 a is disposed with respect to themotor part 10. Thus, it is possible to reduce a size of theelectric oil pump 1 in the radial direction by overlapping an arrangement space of theinlet 41 with an arrangement space of thesubstrate 82 a and minimizing the arrangement space which is separately required. - (Case 50)
-
FIG. 5 is a perspective view of themotor housing 13. Themotor housing 13 includes thecylindrical portion 13 d and thecase 50. As shown inFIGS. 1 and 5 , themotor housing 13 is formed in a rectangular parallelepiped shape and has thecylindrical portion 13 d extending in the axial direction thereof. Thecylindrical portion 13 d has theend surface 52 c in which the rear side thereof is open and the front side thereof is closed. Therefore, thecylindrical portion 13 d is a cylinder having a bottom. The bearing throughhole 50 a which is formed in the axial direction and through which theshaft 11 passes is provided in theend surface 52 c. - The
case 50 is a portion of themotor housing 13 outside thecylindrical portion 13 d. Thecase 50 has asubstrate accommodating portion 84 which is located radially outward from thecylindrical portion 13 d, extends in the axial direction and accommodates thesubstrate 82 a. Further, the assembly 45 refers to a combination of themotor part 10 and thepump part 40. Thesubstrate accommodating portion 84 has a placingsurface portion 84 a which is disposed within an axial range of an assembly 45 to face thecylindrical portion 13 d and on which thesubstrate 82 a is placed. In the embodiment, thesubstrate accommodating portion 84 is located on the +Y side from thecylindrical portion 13 d, and the placingsurface portion 84 a is disposed to face thecylindrical portion 13 d. The placingsurface portion 84 a extends in the axial direction and the X axis direction. That is, the placingsurface portion 84 a extends in a direction orthogonal to the Y axis direction. Therefore, it is possible to suppress an increase in the size of theelectric oil pump 1 in the Y axis direction. - The
substrate accommodating portion 84 is in the form of a bottomed container which is recessed toward thecylindrical portion 13 d and includes the placingsurface portion 84 a which extends in a planar shape in the axial direction and an annular protrudingportion 84 b which protrudes toward the +Y side from a circumferential edge portion of the placingsurface portion 84 a. The placingsurface portion 84 a has a rectangular shape as seen in a direction of the −Y side. Thesubstrate 82 a is accommodated in thesubstrate accommodating portion 84. - (
Substrate 82 a) - As shown in
FIGS. 1 and 2 , a surface of thesubstrate 82 a is disposed on a radially outer side of thecylindrical portion 13 d of themotor housing 13 to face thecylindrical portion 13 d of themotor housing 13 and extends in the axial direction. Further, thesubstrate 82 a has an axial length shorter than an axial length of the assembly 45 formed by combining themotor part 10 and thepump part 40 and is disposed within an axial range of the assembly 45. In the embodiment, thesubstrate 82 a is formed in a rectangular shape and has a similar shape smaller than the placingsurface portion 84 a of thesubstrate accommodating portion 84. In thesubstrate 82 a, thesurface 82 c of thesubstrate 82 a is disposed along the placingsurface portion 84 a of thesubstrate accommodating portion 84. Therefore, thesurface 82 c of thesubstrate 82 a is disposed to face thecylindrical portion 13 d of themotor housing 13. Also, in thesubstrate 82 a, a front side end of thesubstrate 82 a is located on the front side of the assembly 45, and a rear side end of thesubstrate 82 a is located on the rear side of the assembly 45. Therefore, the axial length of thesubstrate 82 a is shorter than the axial length of the assembly 45, and thesubstrate 82 a is disposed within the axial range of the assembly 45. Accordingly, a length of theelectric oil pump 1 in the axial direction is suppressed, and the size thereof can be reduced. - The
substrate 82 a has thesurface 82 c on which the plurality ofelectronic components 82 b are mounted. In the embodiment, thesubstrate 82 a is formed in a plate shape and hasplanar surfaces 82 c on both sides thereof in the Y axis direction. Theelectronic components 82 b are mounted on thesesurfaces 82 c. The plurality ofelectronic components 82 b mounted on thesubstrate 82 a are disposed on thesubstrate 82 a to face thecylindrical portion 13 d of themotor housing 13. In the embodiment, theelectronic components 82 b are disposed in the Y axis direction. Also, among the plurality ofelectronic components 82 b, anelectronic component 82b 1 having a relatively high height is mounted on afront side surface 82 c 2 of thesurfaces 82 c of thesubstrate 82 a opposite to arear side surface 82c 1 facing themotor part 10. In the embodiment, theelectronic component 82b 1 having a relatively high height is a capacitor. Theelectronic component 82b 1 having a relatively high height may be a choke coil. Therefore, it is possible to increase a distance between themotor part 10 and theelectronic component 82b 1 having a relatively high height. Thus, adverse influence on theelectronic component 82b 1 due to heat generation from themotor part 10 can be suppressed. - A
connector portion 82 d electrically connected to thesubstrate 82 a is provided on one side (the front side) of thesubstrate 82 a in the axial direction. On the other hand, thebus bar 73 of thebus bar assembly 75 is electrically connected to the other side (the rear side) of thesubstrate 82 a in the axial direction. In the embodiment, theconnector portion 82 d is a connection terminal. Theconnector portion 82 d extends from thefront side surface 82 c 2 of the front side end of thesubstrate 82 a in the Y axis direction. A plurality of theconnector portions 82 d are disposed at intervals in the X axis direction. That is, theconnector portions 82 d have a plurality of connection terminals. Therefore, theconnector portions 82 d may be disposed at positions away from a connection point in which thebus bar 73 is connected to thesubstrate 82 a. Therefore, it is possible to suppress the possibility that noise generated from thebus bar 73 adversely affects theconnector portions 82 d. - (Substrate Cover 61)
-
FIG. 6 is a side view of the electric oil pump. As shown inFIGS. 4 and 6 , asubstrate cover 61 is disposed in an opening of thesubstrate accommodating portion 84 and closes the opening of thesubstrate accommodating portion 84. Thesubstrate cover 61 is disposed parallel to thesubstrate 82 a. Therefore, theelectric oil pump 1 can be downsized in a direction (the Y direction) orthogonal to the axial direction. Thesubstrate cover 61 has a plurality of fixingportions 85 fixed to thecase 50. In the embodiment, the fixingportions 85 are bolts. -
FIG. 7 is a plan view of theelectric oil pump 1. As shown inFIG. 6 , theelectric oil pump 1 is mounted on a mountingsurface 90 b provided on alower surface 90 a of atransmission 90. Theelectric oil pump 1 is accommodated in anoil pan 93 provided below thetransmission 90. Theelectric oil pump 1 suctions oil in theoil pan 93 from theinlet 41 and discharges it from theoutlet 42. - (Mounting Portion 63)
- As shown in
FIG. 7 , thecase 50 of theelectric oil pump 1 has a plurality of mountingportions 63 to be attached to the mountingsurface 90 b of thetransmission 90. In the embodiment, the mountingportions 63 are provided at a corner portion of thecase 50 as seen in a −X side direction. - Each of the mounting
portions 63 has a mounting throughhole 64 in a center thereof. In theelectric oil pump 1, a bolt (not shown) passes through the mounting throughhole 64, and theelectric oil pump 1 is mounted on the mountingsurface 90 b of thetransmission 90 using this bolt. Each of the mountingportions 63 has aflat surface portion 63 a which comes into contact with the mountingsurface 90 b when theelectric oil pump 1 is mounted on the mountingsurface 90 b. - (Radiation Fin 86)
-
FIG. 8 is a rear view of theelectric oil pump 1. As shown inFIGS. 7 and 8 , thecase 50 has a plurality of radiation fins 86 which extend radially outward from the outer surface of thecylindrical portion 13 d of themotor housing 13 and extend in a direction intersecting the axial direction. In the embodiment, the plurality of radiation fins 86 protrude in the X axis direction and extend in the Y axis direction on both +X side and −X side of the outer surface of thecylindrical portion 13 d of themotor housing 13. The plurality of radiation fins 86 are disposed at intervals in the axial direction. - Radiation fins 86 a provided on the +X side of the outer surface of the
cylindrical portion 13 d of themotor housing 13 and radiation fins 86 b provided on the −X side thereof are disposed on the same plane in the X axis direction. Therefore, the radiation fins 86 a and 86 b extending radially outward from thecylindrical portion 13 d are connected in the X axis direction. Heat from thesubstrate 82 a and themotor part 10 can be dissipated by these radiation fins 86. - (Support Portion 77)
- As shown in
FIGS. 7 and 8 , thecase 50 has asupport portion 77 which extends radially outward from the outer surface of thecylindrical portion 13 d of themotor housing 13 and connects a pair of radiation fins 86 adjacent to each other in the axial direction. In the embodiment, thesupport portion 77 is provided between a pair of radiation fins 86 which extend radially outward from the outer surface of thecylindrical portion 13 d of themotor housing 13 and are adjacent to each other in the axial direction. Thesupport portion 77 extends between the pair of radiation fins 86 in a plate shape in a direction (the Y axis direction) orthogonal to the axial direction. Further, thesupport portion 77 has an inter-fin throughhole 78 which extends in a direction intersecting theflat surface portion 63 a of the mountingportion 63 and passes through thesupport portion 77. In the embodiment, the inter-fin throughhole 78 extends in a direction orthogonal to theflat surface portion 63 a. Therefore, when the mountingportion 63 is mounted on the mountingsurface 90 b of thetransmission 90, the inter-fin throughhole 78 can be oriented in a vertical direction. Accordingly, it is possible to easily allow the oil to flow downward through the inter-fin throughhole 78. - As shown in
FIG. 8 , thecase 50 has arib 88 which connects the pair of radiation fins 86 adjacent to each other in the axial direction. In the embodiment, therib 88 extends between the pair of radiation fins 86 adjacent to each other in the axial direction from the outer surface of thecylindrical portion 13 d of themotor housing 13 in the X axis direction. Thus, the radiation fins 86 are connected to the other radiation fins 86 adjacent to each other in the axial direction via theribs 88 and also connected to thecylindrical portion 13 d. Therefore, the plurality of radiation fins 86 can further enhance rigidity through theribs 88. - <Operation and Effect of
Electric Oil Pump 1> - Next, the operation and effect of the
electric oil pump 1 will be described. As shown inFIGS. 1 and 2 , when themotor part 10 of theelectric oil pump 1 is driven, theshaft 11 of the motor part rotates, and theouter rotor 47 b also rotates as theinner rotor 47 a of thepump rotor 47 rotates. When thepump rotor 47 rotates, the oil suctioned from theinlet 41 of thepump part 40 moves through theaccommodating portion 60 of thepump part 40 and is discharged from theoutlet 42. - (1) Here, in the
electric oil pump 1 according to the embodiment, as shown inFIG. 1 , thesurface 82 c of thesubstrate 82 a is disposed on the radially outer side of thecylindrical portion 13 d of themotor housing 13 to face thecylindrical portion 13 d of themotor housing 13 and extends in the axial direction. Also, thesubstrate 82 a has the axial length shorter than the axial length of the assembly 45 formed by combining themotor part 10 and thepump part 40 and is thus disposed within the axial range of the assembly 45. Therefore, thesubstrate 82 a does not protrude axially outward from theelectric oil pump 1 in the axial direction. Further, the size of thesubstrate 82 a protruding radially outward from themotor part 10 can be suppressed. Therefore, theelectric oil pump 1 can be downsized. - (2) Further, the plurality of
electronic components 82 b mounted on thesubstrate 82 a are disposed on thesubstrate 82 a to face themotor housing 13. Therefore, the plurality ofelectronic components 82 b can be disposed compactly on thesubstrate 82 a in the axial direction. Thus, the axial length of thesubstrate 82 a can be further shortened. - (3) Further, among the plurality of
electronic components 82 b, theelectronic component 82b 1 having a relatively high height is mounted on thefront side surface 82 c 2 opposite to therear side surface 82c 1 of thesubstrate 82 a facing themotor part 10 side. Therefore, it is possible to increase a distance between themotor part 10 and theelectronic component 82b 1 having the relatively high height. Thus, it is possible to suppress an adverse effect due to heat generation from themotor part 10 on theelectronic component 82b 1 having the relatively high height. - (4) Further, the
connector portion 82 d electrically connected to thesubstrate 82 a is provided on one side of thesubstrate 82 a in the axial direction, and thebus bar 73 connected to the connectingbus bar 35 is electrically connected to the other side of thesubstrate 82 a in the axial direction. Therefore, theconnector portion 82 d can be disposed at a position away from a connection point in which thebus bar 73 is connected to thesubstrate 82 a. Thus, it is possible to suppress the possibility that noise generated from thebus bar 73 adversely affects theconnector portion 82 d. - (5) Further, the
substrate accommodating portion 84 has the placingsurface portion 84 a which is disposed in the axial range of the assembly 45 to face thecylindrical portion 13 d and on which thesubstrate 82 a is placed. The arrangement of thesubstrate 82 a with respect to the assembly 45 can be facilitated by disposing thesubstrate 82 a in thesubstrate accommodating portion 84. - (6) Further, the
case 50 has the plurality of radiation fins 86 which extend radially outward from the outer surface of thecylindrical portion 13 d and extend in a direction intersecting the axial direction. Therefore, since thecase 50 has the plurality of radiation fins 86, it is possible to increase an area of a portion in which heat is radiated. Thus, it is possible to effectively dissipate the heat generated from themotor part 10 and the heat generated from thesubstrate 82 a via the radiation fins 86. - (7) Further, the
case 50 has thesupport portion 77 which extends radially outward from the outer surface of thecylindrical portion 13 d of themotor housing 13 and connects a pair of radiation fins 86 adjacent to each other in the axial direction. Therefore, since the plurality of radiating fins 86 are integrally connected via thesupport portion 77, the rigidity of the plurality of radiation fins 86 can be improved. - (8) Further, the
case 50 has the plurality of mountingportions 63 mounted on the mountingsurface 90 b provided in thetransmission 90 of a vehicle. Therefore, theelectric oil pump 1 can be mounted in thetransmission 90 by mounting the mountingportion 63 to the mountingsurface 90 b of thetransmission 90. - (9) Further, since each of the plurality of mounting
portions 63 has theflat surface portion 63 a which is in surface contact with the mountingsurface 90 b, the mountingportion 63 can be mounted on the mountingsurface 90 b in a state in which theflat surface portion 63 a is in surface contact with the mountingsurface 90 b. Therefore, it is possible to firmly mount theelectric oil pump 1 in thetransmission 90. - (10) Further, the
support portion 77 has the inter-fin throughhole 78 which extends in a direction intersecting theflat surface portion 63 a and passes through thesupport portion 77. Therefore, even when a liquid such as oil tries to be stored between the radiation fins 68, it is possible to discharge the liquid to the outside of theelectric oil pump 1 via the inter-fin throughhole 78. - (11) Further, the plurality of radiating fins 86 are disposed at intervals in the axial direction, and the
case 50 has theribs 88 which connects a pair of radiation fins 86 adjacent to each other in the axial direction. Therefore, the plurality of radiation fins 86 can further enhance the rigidity through theribs 88. - (12) In addition, the
electronic component 82b 1 having the relatively high height is a capacitor or a choke coil. Therefore, it is possible to suppress the influence of heat generation from themotor part 10 on the capacitor or the choke coil. - Although the exemplary embodiments of the disclosure have been described above, the disclosure is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof. These embodiments and variations thereof are included in the scope and gist of the disclosure and, at the same time, are included in the disclosure described in the claims and the equivalent scope thereof.
Claims (12)
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JP2018-069199 | 2018-03-30 | ||
JP2018069199A JP7135388B2 (en) | 2018-03-30 | 2018-03-30 | electric oil pump |
JPJP2018-069199 | 2018-03-30 |
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US20190301596A1 true US20190301596A1 (en) | 2019-10-03 |
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US16/357,346 Active 2039-11-27 US11199255B2 (en) | 2018-03-30 | 2019-03-19 | Electric oil pump |
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US20190195345A1 (en) * | 2017-12-21 | 2019-06-27 | Nidec Tosok Corporation | Electric Oil Pump |
WO2021144117A1 (en) * | 2020-01-13 | 2021-07-22 | Schwäbische Hüttenwerke Automotive GmbH | Pump/motor unit |
CN114649897A (en) * | 2020-12-17 | 2022-06-21 | 丰田自动车株式会社 | Motor attachment structure for electric vehicle |
US20220235765A1 (en) * | 2021-01-25 | 2022-07-28 | Nidec Tosok Corporation | Electric pump |
US20220320942A1 (en) * | 2021-03-31 | 2022-10-06 | Nidec Tosok Corporation | Rotary electric machine and pump |
US20220320941A1 (en) * | 2021-03-31 | 2022-10-06 | Nidec Tosok Corporation | Rotary electric machine and pump |
USD974413S1 (en) * | 2020-09-30 | 2023-01-03 | Nidec Tosok Corporation | Electric oil pump |
USD1005341S1 (en) | 2020-09-30 | 2023-11-21 | Nidec Tosok Corporation | Electric oil pump |
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US20220320974A1 (en) * | 2021-03-30 | 2022-10-06 | Nidec Tosok Corporation | Electric pump |
DE202022103701U1 (en) * | 2021-07-05 | 2022-09-27 | Hyundai Mobis Co., Ltd. | Rotor plate and rotor arrangement with this rotor plate |
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-
2019
- 2019-03-19 US US16/357,346 patent/US11199255B2/en active Active
- 2019-03-22 CN CN201920371035.4U patent/CN209908755U/en active Active
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US20190195345A1 (en) * | 2017-12-21 | 2019-06-27 | Nidec Tosok Corporation | Electric Oil Pump |
US11512774B2 (en) * | 2017-12-21 | 2022-11-29 | Nidec Tosok Corporation | Electric oil pump |
WO2021144117A1 (en) * | 2020-01-13 | 2021-07-22 | Schwäbische Hüttenwerke Automotive GmbH | Pump/motor unit |
USD974413S1 (en) * | 2020-09-30 | 2023-01-03 | Nidec Tosok Corporation | Electric oil pump |
USD1005341S1 (en) | 2020-09-30 | 2023-11-21 | Nidec Tosok Corporation | Electric oil pump |
CN114649897A (en) * | 2020-12-17 | 2022-06-21 | 丰田自动车株式会社 | Motor attachment structure for electric vehicle |
US20220235765A1 (en) * | 2021-01-25 | 2022-07-28 | Nidec Tosok Corporation | Electric pump |
US11973380B2 (en) * | 2021-01-25 | 2024-04-30 | Nidec Tosok Corporation | Electric pump |
US20220320942A1 (en) * | 2021-03-31 | 2022-10-06 | Nidec Tosok Corporation | Rotary electric machine and pump |
US20220320941A1 (en) * | 2021-03-31 | 2022-10-06 | Nidec Tosok Corporation | Rotary electric machine and pump |
Also Published As
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US11199255B2 (en) | 2021-12-14 |
JP7135388B2 (en) | 2022-09-13 |
CN209908755U (en) | 2020-01-07 |
JP7464089B2 (en) | 2024-04-09 |
JP2019180172A (en) | 2019-10-17 |
JP2022169778A (en) | 2022-11-09 |
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